#3739AA#3739AA

#3739AA is a dark, vivid blue. Relative luminance 0.066; OKLCH L 42.0% C 0.176 H 275.0°. Best body text is #FFFFFF at 9.02:1 contrast (WCAG AA passes).

Color values

HEX	#3739AA
RGB	rgb(55, 57, 170)
HSL	hsl(239, 51%, 44%)
HSV	hsv(239, 68%, 67%)
CMYK	cmyk(67.6%, 66.5%, 0%, 33.3%)
CIE-LAB	lab(30.97, 35.85, -60.76)
CIE-LCH	lch(30.97, 70.55, 300.54°)
OKLab	oklab(41.97% 0.0153 -0.1754)
OKLCH	oklch(41.97% 0.176 275)
XYZ	xyz(10.2920, 6.6398, 38.7617)
Luminance	0.0664 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Blue With A Hint Of Purple

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3739AA #AAA837

analogous

#3772AA #3739AA #6F37AA

triadic

#3739AA #AA3739 #39AA37

tetradic

#3739AA #AA3772 #AAA837 #37AA6F

square

#3739AA #AA3772 #AAA837 #37AA6F

split-complementary

#3739AA #AA6F37 #72AA37

monochromatic

#191A4E #28297C #3739AA #5658C8 #8486D7

Accessibility & contrast

On white

9.02

#3739AA on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.33

#3739AA on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3739AA

9.02:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3739AA	#FFFFFF	#000000	##FFFFFF
##3739AA	1.00	9.02	2.33	9.02
#FFFFFF	9.02	1.00	21.00	1.00
#000000	2.33	21.00	1.00	21.00
##FFFFFF	9.02	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004EAE

Deuteranopia (green-blind)

#0044A8

Tritanopia (blue-blind)

#00576C

Achromatopsia (no color)

#494949

Design tokens & code

CSS

--color: #3739aa;
/* rgb */ color: rgb(55, 57, 170);
/* oklch */ color: oklch(42.0% 0.176 275.0);

Tailwind

colors: {
  custom: {
    50: '#7d70c4',
    500: '#3739aa',
    950: '#000000',
  },
}

SCSS

$custom: #3739aa;
$custom-light: #7d70c4;
$custom-dark: #000000;

JSON

{
  "hex": "#3739aa",
  "rgb": {
    "r": 55,
    "g": 57,
    "b": 170
  },
  "hsl": {
    "h": 238.957,
    "s": 51.111,
    "l": 44.118
  },
  "oklch": {
    "l": 0.41971,
    "c": 0.17604,
    "h": 275
  },
  "luminance": 0.06641
}

Semantic roles & 50–950 ramp

primary

#3739AA

secondary

#C1C07C

accent

#D84DDB

background

#F8F6FC

surface

#EFECF8

border

#CAC7D1

text

#0B0713

muted

#7C7A82

Preview Lab

Preview with #3739AA

Body copy rendered with the generated semantic roles for this colour.

Preview Lab → · Contrast checker → · Palette generator →